electrical

PCB Trace Width

Minimum trace width from IPC-2221 for a given current and copper weight.

Inputs — IPC-2221 (External Layer)

Current I

Copper Weight

Temp Rise ΔT

°C

Results — Min Trace Width

Width (mm)—

Width (mils)—

Cross-section Area—

A = (I / k·ΔT⁰·⁴⁴)^(1/0.725) · W = A / (oz × 1.378)

Add ≥ 20% margin to the computed minimum for safety.
k = 0.048 (IPC-2221, external layers).